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    Subject[PATCH V3 15/16] MIPS: Fix poweroff failure when HOTPLUG_CPU configured.
    Date
    When poweroff machine, kernel_power_off() call disable_nonboot_cpus().
    And if we have HOTPLUG_CPU configured, disable_nonboot_cpus() is not an
    empty function but attempt to actually disable the nonboot cpus. Since
    system state is SYSTEM_POWER_OFF, play_dead() won't be called and thus
    disable_nonboot_cpus() hangs. Therefore, we make this patch to avoid
    poweroff failure.

    Signed-off-by: Huacai Chen <chenhc@lemote.com>
    Signed-off-by: Hongliang Tao <taohl@lemote.com>
    Signed-off-by: Hua Yan <yanh@lemote.com>
    Reviewed-by: Yong Zhang <yong.zhang@windriver.com>
    Cc: stable@vger.kernel.org
    ---
    arch/mips/kernel/process.c | 4 +---
    1 files changed, 1 insertions(+), 3 deletions(-)

    diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
    index e9a5fd7..69b17a9 100644
    --- a/arch/mips/kernel/process.c
    +++ b/arch/mips/kernel/process.c
    @@ -72,9 +72,7 @@ void __noreturn cpu_idle(void)
    }
    }
    #ifdef CONFIG_HOTPLUG_CPU
    - if (!cpu_online(cpu) && !cpu_isset(cpu, cpu_callin_map) &&
    - (system_state == SYSTEM_RUNNING ||
    - system_state == SYSTEM_BOOTING))
    + if (!cpu_online(cpu) && !cpu_isset(cpu, cpu_callin_map))
    play_dead();
    #endif
    rcu_idle_exit();
    --
    1.7.7.3


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